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The Test Set by Posit

Posit, PBC
Data Science
Python
Open Source
Artificial Intelligence
Posit
Pandas
Apache Arrow
Narwhals
Positron
Large Language Models
Polars
Tidyverse
Environmental Health
DBT
Hex
Meremo
Ibis
Duckdb
Statistical Analysis
Education

A Posit podcast for data science junkies, anomaly hunters, and those who play outside the confidence interval. Hosted by Michael Chow, with co-hosts Wes McKinney & Hadley Wickham.

PublishesTwice monthlyEpisodes32Foundeda year ago
Number of ListenersCategory
Technology

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Artwork for The Test Set by Posit

Latest Episodes

Greg Swinehart mocked up the first rstudio.org, and JJ Allaire and Joe Cheng sent it back for looking too good. He's been at it ever since, from hex stickers to Shiny's new look. He and Michael Chow get into the "JJ Allaire patented heat index," why ... more

YouTube

Posit CEO Tareef Kawaf’s theory about LLMs is that they work like an exponent on whoever you already are. Greater than one and you compound. Under one and you accelerate in the wrong direction. Michael, Wes, and Hadley chat with Tareef about what tha... more

YouTube

Leland McInnes has spent his career building tools a lot data scientists take for granted (UMAP, HDBSCAN), and amusingly the applications of those tools keep getting stranger. On this episode of The Test Set, he tells Michael, Hadley, and Wes about t... more

YouTube

Ruth Milligan has coached hundreds of conference speakers, curates TEDx Columbus, and wrote The Motivated Speaker. She's here to tell you that speaking is habitual, not natural. Michael, Wes, and Hadley get a live fifteen-second filler word hack, an ... more

YouTube

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Recent Guests

Greg Swinehart
Designer at Posit who has worked on its visual identity and Shiny's interface.
Posit
Episode: The Bus Has to Jump 50 Feet — Greg Swinehart
Tareef Kawaf
CEO of Posit
Posit
Episode: You're the Base, AI Is the Exponent — with Tareef Kawaf
Leland McInnes
Research mathematician and data scientist, creator of UMAP
TUT Institute for Mathematics and Computing
Episode: Smuggled Gold and Untrustworthy Intuition — with Leland McInnes
Ruth Milligan
Founder at Articulation; TEDx Columbus curator; author of The Motivated Speaker
Articulation, TEDx Columbus
Episode: Nobody Remembers Your 20 Charts — with Ruth Milligan
Trevor Manz
Founding engineer at Meremo, visualization researcher
Meremo
Episode: Let the Agent Cook — with Trevor Manz
Caitlin Colgrove
CTO and co-founder of Hex
Hex
Episode: Confidently Incorrect — with Caitlin Colgrove
Alex Hillman
Author of The Tiny MBA; co-founder of Indie Hall and Stacking the Bricks
Indie Hall / Stacking the Bricks
Episode: The Bothness of It — with Alex Hillman
Mike Bostock
Creator of D3, founder of Observable
Observable
Episode: The Code Doesn't Lie — with Mike Bostock
Vincent Warmerdam
First full-time hire at Marimo, founder of comcode.io
Marimo; comcode.io
Episode: Widgets Are Lego Bricks (and Other Things People Are Sleeping On) — with Vincent Warmerdam

Hosts

Michael Chow
Host of The Test Set; long-running Posit software engineer and leader.
Hadley Wickham
Co-host/Chief Scientist at Posit with extensive contributions to data science tooling and open-source projects.
Wes McKinney
Co-host and Principal Architect; key figure behind major data tooling efforts.

Chart Rankings

How this podcast ranks in the Apple Podcasts, Spotify and YouTube charts.

Apple Podcasts
#207
Canada/Technology
Apple Podcasts
#72
Poland/Technology

Talking Points

Recent interactions between the hosts and their guests.

The Bus Has to Jump 50 Feet — Greg Swinehart
Q: And how did you get into design?
Swinehart began making band shirts, stickers, album art, and posters, then learned design fundamentals from a graphic-designer housemate who mentored him for over a year.
The Bus Has to Jump 50 Feet — Greg Swinehart
Q: If you had to capture, what did that audience want that was different from what you had in mind? Like what does an open-source audience?
Swinehart says the design needed to signal that RStudio was a usable, genuinely open-source tool for data science, rather than a flashy startup that might disappear or change its terms.
Nobody Remembers Your 20 Charts — with Ruth Milligan
Q: How did Ruth's coaching philosophy shape the PositConf speaker program?
Ruth explains that the training centers on extracting a single core idea from every talk, and then guiding speakers to support that idea with structure, visuals, and peer feedback across five coaching sessions.
The Bothness of It — with Alex Hillman
Q: How do you explain your approach to marketing to open-source communities?
Focus on earning trust and aligning incentives with the community, rather than traditional sales tactics; emphasize transparency and mutual benefit over manipulation.
Sleeping Rats and Sociopathic Agents — with Phillip Cloud
Q: What are your thoughts on the most exciting development for developers today, especially regarding AI and productivity?
He reflects that AI is intriguing but not the sole driver; the key is developer productivity and the way AI changes how we measure and improve it, along with how tools like VS Code and modern CLIs have reshaped workflows.

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Frequently Asked Questions About The Test Set by Posit

What is The Test Set by Posit about and what kind of topics does it cover?

Across episodes, the show centers on data tooling, open-source ecosystems, and the practical realities of building data products in modern organizations. Conversations often explore how notebooks, AI assistants, and governance-friendly workflows reshape collaboration between data teams and non-technical stakeholders, with deep dives into visualization tooling, analytics engineering, SQL-centric tooling, and the evolving roles of data leaders. Notable throughlines include the tension between rapid AI-enabled experimentation and rigorous data quality, the role of community and open source in shaping tooling, and real-world case studies—from enterprise dashboards to Python and notebook ecosystems—demonstrating how data culture is evolving in l... more

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1. R Weekly Highlights
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The Test Set by Posit launched a year ago and published 32 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

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What guests have appeared on The Test Set by Posit?

Recent guests on The Test Set by Posit include:

1. Greg Swinehart
2. Tareef Kawaf
3. Leland McInnes
4. Ruth Milligan
5. Trevor Manz
6. Caitlin Colgrove
7. Alex Hillman
8. Mike Bostock

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